body {
	background-color: #f1f1f1;
}

div  {
	display: block;
}

#header {
	margin: auto;
	width: 700px;
	height: 200px;
	background-color: white;
	box-shadow: 0px 0px 20px 3px #d3d3d3;
	border-radius: 4px;
	/*padding: 20px;*/
}

#header_banner_img {
	margin: auto;
	padding-top: 20px;
	width: 490px;
	height: 160px;
	background: url(../image/banner.jpg) no-repeat
}

#content {
	margin: auto;
	width: 700px;
	height: 500px;
}

#left_nav {
	width: 200px;
	height: 420px;
	background-color: white;
	box-shadow: 0px 0px 20px 3px #d3d3d3;
	border-radius: 4px;
	margin-top: 20px;
	margin-left: 0px;
	float: left;
}

.left_button {
	width: 200px;
	height: 35px;
	line-height: 40px;
	background-color: #333;
	box-shadow: 0px 0px 5px 3px #d3d3d3;
	border-radius: 6px;
	margin-top: 5px;
	margin-bottom: 5px;
	font: 14px/18px arial,"\5b8b\4f53",sans-serif,"Microsoft YaHei",tahoma;
	color: white;
	text-align: center;
	vertical-align: bottom;
	padding-top: 15px;
	display: block;
	text-decoration: none;
}

#right_content {
	height: 420px;
	width: 480px;
	font: 32px/36px arial,"\5b8b\4f53",sans-serif,"Microsoft YaHei",tahoma;
	background-color: white;
	font-weight: bold;
	margin-left: 20px;
	margin-top: 20px;
	float: left;
	text-align: center;
	vertical-align: middle;
	box-shadow: 0px 0px 20px 3px #d3d3d3;
	border-radius: 4px;
}

#footer {
	margin: auto;
	width: 100%;
	height: 80px;
}